1986 Subaru RXFACTORY OEM SERVICE PROCEDURE

Turbo Models

Fuel travels from fuel tank to canister in the same manner as models without turbo. The difference is in the way canister is purged.

Turbo models use a main purge line from canister purge control valve to intake manifold, and an auxiliary purge line from top of canister to air intake above throttle valve.

When engine is running, throttle body vacuum opens purge control valve and allows stored vapor to flow out of canister through main purge line into intake manifold. Canister purging stops when engine is running at turbo boost or when engine is stopped.

Intake air draws canister vapor through secondary purge line whenever engine is running.

Fig 1: Multi-Point Turbocharged Fuel Injected Engine Fuel Evap. System
G37946
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.